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TPS73633DBVR

400mA LDO, 3.3V, 30uVrms noise, 70dB PSRR, 75mV dropout, SOT-23-5, TI TPS736

10491

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Manufacturer Part：

TPS73633DBVR

Package：

SOT-23-5 (DBV, 2.9 x 1.6 x 1.15mm)

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Description

Product Overview

The TI TPS73633DBVR is a 400mA low-noise LDO providing a fixed 3.3V output in SOT-23-5 package. With 75mV ultra-low dropout, 30uVrms output noise, and 70dB PSRR at 1kHz, it is designed for noise-sensitive RF, analog, and precision measurement applications requiring the cleanest possible power supply.

Key Specifications

Output Voltage 3.3V (fixed)
Output Current 400mA
Input Voltage 2.7V to 5.5V
Dropout Voltage 75mV @ 400mA
Quiescent Current 950uA (typical)
Output Noise 30uVrms (10Hz-100kHz)
PSRR 70dB @ 1kHz
Accuracy ±1%
Package SOT-23-5 (DBV)
Operating Temperature -40°C to +125°C

Features

  • 30uVrms ultra-low output noise
  • 70dB PSRR at 1kHz
  • 75mV ultra-low dropout at 400mA
  • NR pin for noise reduction capacitor
  • Fast transient response
  • Stable with 2.2uF ceramic output

Applications

  • RF transceiver power supply
  • ADC/DAC voltage reference
  • Precision analog front-end
  • Low-phase-noise oscillator supply
  • Medical instrumentation

The TI TPS73633DBVR is a 400mA ultra-low-noise LDO providing a fixed 3.3V output with 30uVrms output noise and 70dB PSRR in SOT-23-5 package. The 75mV dropout at full load and noise reduction (NR) pin make it ideal for the most noise-sensitive RF, analog, and precision measurement applications where supply cleanliness directly impacts system performance.

The TPS73633DBVR uses a PMOS pass element with a noise reduction (NR) pin connected to the internal bandgap reference. An external capacitor on the NR pin filters reference noise, achieving 30uVrms output noise. The PMOS topology provides 75mV dropout voltage at 400mA with no ground current increase at dropout (unlike PNP LDOs). The 70dB PSRR effectively isolates the output from input supply noise, critical for RF and precision analog circuits.

Pin Name Type Function
1 IN Input Input supply (2.7-5.5V)
2 GND Ground Ground
3 EN Input Enable (active high)
4 NR I/O Noise reduction capacitor
5 OUT Output 3.3V regulated output
  • RF transceiver VDD clean power supply
  • 24-bit ADC voltage reference supply
  • Precision analog front-end 3.3V rail
  • Low-phase-noise crystal oscillator supply
  • Medical ECG/EEG analog supply
Manufacturer Part Number Package Notes
TI TPS7A8300RGRR VQFN-10 2A, lower noise
ADI LT1761ES5-3.3#TRMPBF SOT-23-5 20uVrms, lower noise
TI TPS73633DDCR SOT-23-5 Same function, different pkg code
onsemi NCP511SN33T1G SOT-23-5 150mA, 30uVrms
TI TPS73625DBVR SOT-23-5 2.5V version
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